ceph/src/boost/libs/proto/include/boost/proto/detail/basic_expr.hpp

   1 #if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES)
   2
   3     #include <boost/proto/detail/preprocessed/basic_expr.hpp>
   4
   5 #elif !defined(BOOST_PP_IS_ITERATING)
   6
   7     /// INTERNAL ONLY
   8     ///
   9     #define BOOST_PROTO_CHILD(Z, N, DATA)                                                       \
  10         typedef BOOST_PP_CAT(Arg, N) BOOST_PP_CAT(proto_child, N);                              \
  11         BOOST_PP_CAT(proto_child, N) BOOST_PP_CAT(child, N);                                    \
  12         /**< INTERNAL ONLY */
  13
  14     /// INTERNAL ONLY
  15     ///
  16     #define BOOST_PROTO_VOID(Z, N, DATA)                                                        \
  17         typedef void BOOST_PP_CAT(proto_child, N);                                              \
  18         /**< INTERNAL ONLY */
  19
  20     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
  21         #pragma wave option(preserve: 2, line: 0, output: "preprocessed/basic_expr.hpp")
  22     #endif
  23
  24     ///////////////////////////////////////////////////////////////////////////////
  25     /// \file basic_expr.hpp
  26     /// Contains definition of basic_expr\<\> class template.
  27     //
  28     //  Copyright 2008 Eric Niebler. Distributed under the Boost
  29     //  Software License, Version 1.0. (See accompanying file
  30     //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  31
  32     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
  33         #pragma wave option(preserve: 1)
  34     #endif
  35
  36     // The expr<> specializations are actually defined here.
  37     #define BOOST_PROTO_DEFINE_TERMINAL
  38     #define BOOST_PP_ITERATION_PARAMS_1 (3, (0, 0, <boost/proto/detail/basic_expr.hpp>))
  39     #include BOOST_PP_ITERATE()
  40
  41     #undef BOOST_PROTO_DEFINE_TERMINAL
  42     #define BOOST_PP_ITERATION_PARAMS_1 (3, (1, BOOST_PROTO_MAX_ARITY, <boost/proto/detail/basic_expr.hpp>))
  43     #include BOOST_PP_ITERATE()
  44
  45     #if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
  46         #pragma wave option(output: null)
  47     #endif
  48
  49     #undef BOOST_PROTO_CHILD
  50     #undef BOOST_PROTO_VOID
  51
  52 #else
  53
  54     #define ARG_COUNT BOOST_PP_MAX(1, BOOST_PP_ITERATION())
  55
  56     /// \brief Simplified representation of a node in an expression tree.
  57     ///
  58     /// \c proto::basic_expr\<\> is a node in an expression template tree. It
  59     /// is a container for its child sub-trees. It also serves as
  60     /// the terminal nodes of the tree.
  61     ///
  62     /// \c Tag is type that represents the operation encoded by
  63     ///             this expression. It is typically one of the structs
  64     ///             in the \c boost::proto::tag namespace, but it doesn't
  65     ///             have to be.
  66     ///
  67     /// \c Args is a type list representing the type of the children
  68     ///             of this expression. It is an instantiation of one
  69     ///             of \c proto::list1\<\>, \c proto::list2\<\>, etc. The
  70     ///             child types must all themselves be either \c expr\<\>
  71     ///             or <tt>proto::expr\<\>&</tt>. If \c Args is an
  72     ///             instantiation of \c proto::term\<\> then this
  73     ///             \c expr\<\> type represents a terminal expression;
  74     ///             the parameter to the \c proto::term\<\> template
  75     ///             represents the terminal's value type.
  76     ///
  77     /// \c Arity is an integral constant representing the number of child
  78     ///             nodes this node contains. If \c Arity is 0, then this
  79     ///             node is a terminal.
  80     ///
  81     /// \c proto::basic_expr\<\> is a valid Fusion random-access sequence, where
  82     /// the elements of the sequence are the child expressions.
  83     #ifdef BOOST_PROTO_DEFINE_TERMINAL
  84     template<typename Tag, typename Arg0>
  85     struct basic_expr<Tag, term<Arg0>, 0>
  86     #else
  87     template<typename Tag BOOST_PP_ENUM_TRAILING_PARAMS(ARG_COUNT, typename Arg)>
  88     struct basic_expr<Tag, BOOST_PP_CAT(list, BOOST_PP_ITERATION())<BOOST_PP_ENUM_PARAMS(ARG_COUNT, Arg)>, BOOST_PP_ITERATION() >
  89     #endif
  90     {
  91         typedef Tag proto_tag;
  92         static const long proto_arity_c = BOOST_PP_ITERATION();
  93         typedef mpl::long_<BOOST_PP_ITERATION() > proto_arity;
  94         typedef basic_expr proto_base_expr;
  95         #ifdef BOOST_PROTO_DEFINE_TERMINAL
  96         typedef term<Arg0> proto_args;
  97         #else
  98         typedef BOOST_PP_CAT(list, BOOST_PP_ITERATION())<BOOST_PP_ENUM_PARAMS(ARG_COUNT, Arg)> proto_args;
  99         #endif
 100         typedef basic_expr proto_grammar;
 101         typedef basic_default_domain proto_domain;
 102         typedef default_generator proto_generator;
 103         typedef proto::tag::proto_expr<Tag, proto_domain> fusion_tag;
 104         typedef basic_expr proto_derived_expr;
 105         typedef void proto_is_expr_; /**< INTERNAL ONLY */
 106
 107         BOOST_PP_REPEAT(ARG_COUNT, BOOST_PROTO_CHILD, ~)
 108         BOOST_PP_REPEAT_FROM_TO(ARG_COUNT, BOOST_PROTO_MAX_ARITY, BOOST_PROTO_VOID, ~)
 109
 110         /// \return *this
 111         ///
 112         BOOST_FORCEINLINE
 113         basic_expr const &proto_base() const
 114         {
 115             return *this;
 116         }
 117
 118         /// \overload
 119         ///
 120         BOOST_FORCEINLINE
 121         basic_expr &proto_base()
 122         {
 123             return *this;
 124         }
 125
 126     #ifdef BOOST_PROTO_DEFINE_TERMINAL
 127         /// \return A new \c expr\<\> object initialized with the specified
 128         /// arguments.
 129         ///
 130         template<typename A0>
 131         BOOST_FORCEINLINE
 132         static basic_expr const make(A0 &a0)
 133         {
 134             return detail::make_terminal(a0, static_cast<basic_expr *>(0), static_cast<proto_args *>(0));
 135         }
 136
 137         /// \overload
 138         ///
 139         template<typename A0>
 140         BOOST_FORCEINLINE
 141         static basic_expr const make(A0 const &a0)
 142         {
 143             return detail::make_terminal(a0, static_cast<basic_expr *>(0), static_cast<proto_args *>(0));
 144         }
 145     #else
 146         /// \return A new \c expr\<\> object initialized with the specified
 147         /// arguments.
 148         ///
 149         template<BOOST_PP_ENUM_PARAMS(ARG_COUNT, typename A)>
 150         BOOST_FORCEINLINE
 151         static basic_expr const make(BOOST_PP_ENUM_BINARY_PARAMS(ARG_COUNT, A, const &a))
 152         {
 153             basic_expr that = {BOOST_PP_ENUM_PARAMS(ARG_COUNT, a)};
 154             return that;
 155         }
 156     #endif
 157
 158     #if 1 == BOOST_PP_ITERATION()
 159         /// If \c Tag is \c boost::proto::tag::address_of and \c proto_child0 is
 160         /// <tt>T&</tt>, then \c address_of_hack_type_ is <tt>T*</tt>.
 161         /// Otherwise, it is some undefined type.
 162         typedef typename detail::address_of_hack<Tag, proto_child0>::type address_of_hack_type_;
 163
 164         /// \return The address of <tt>this->child0</tt> if \c Tag is
 165         /// \c boost::proto::tag::address_of. Otherwise, this function will
 166         /// fail to compile.
 167         ///
 168         /// \attention Proto overloads <tt>operator&</tt>, which means that
 169         /// proto-ified objects cannot have their addresses taken, unless we use
 170         /// the following hack to make \c &x implicitly convertible to \c X*.
 171         BOOST_FORCEINLINE
 172         operator address_of_hack_type_() const
 173         {
 174             return boost::addressof(this->child0);
 175         }
 176     #else
 177         /// INTERNAL ONLY
 178         ///
 179         typedef detail::not_a_valid_type address_of_hack_type_;
 180     #endif
 181     };
 182
 183 #undef ARG_COUNT
 184
 185 #endif